I'm running a supra NA flywheel for the weight savings without going a super lightweight AL one.
W55 or W58 really has no bearing on the flywheel u can use.
It's more about the clutch/PP that you choose as that has to be matched to the sprung/unsprung flywheel.
Car sold to a good new home!
Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms